Atoms that are unable to pass one another become free to migrate during state shifts such as sublimation and melting. While atoms also have a tendency to clash when a solid material melts.
This allows them to slip past one another. As a result, we may say that as an object melts or sublimation, its state changes, allowing atoms that can't travel past one another to do so. A substance can transfer directly from the solid to the gas state through sublimation, bypassing the liquid step. A substance can change its phase from a solid to a liquid by the physical process of melting or fusion. When the solid's internal energy increases, usually as a result of the application of heat causes melting.
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